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2 Sheets-Sheet 1;

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H. E. BRADLEY. ELEGTRIG ARC LAMP. No. 557,648. Patented Apr 7, 18 96.

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U ITED STATES PATENT OFFICE."

HAROLD E. BRADLEY, OF PAW TUCKET, RHODE ISLAND.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 557,648, dated April 7, 1896.

Application filed February 6, 1896. Serial No. 578,250. (No model.)

To all whom it may concern:

Be it known that I, HAROLD E. BRADLEY, a citizen of the United States, residing at Pawtucket, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in arc-lamps in which the movement of the carbon is controlled by the operation of a train of gears actuated by suitable magnets and a regulating device; and the object of my improvement is to provide a 1n echanism by which the movement of the carbon may be rendered regular and steady.

Another feature of my invention consists of the suspension of all working parts of the lamp from the upper portion or cap thereof, by which I secure a more fixed and permanent alineinent of the various portions of the lamp. These objects are secured by the mechanism shown in the accompanying drawings, in which Figure 1 is the elevation. of the controllingmagnet and gearwork and the regulating device, and Figs. 2 and 3 the same in different positions of the carbon. Figs. l and 5 show my improved framework.

The same letters refer to the same parts throughout the various drawings.

In Fig. 1, a is the base-plate supporting the shunt-magnet b, the standard 0, and the working parts of the lamp. (Z d is a carbon-rod from the lower portion of which the carbon is suspended. The left-hand edge of cl is toothed, so as to form a rack, which engages the train of gears Z g, &c., terminating in the starwheel 7t. This train of gears is mounted in the frame 9, pivoted at h. At one end of g, the short end of the lever, is the spiral spring 6, which connects the short end of g with the base-plate a. The other or long end of the lever is attached to a movable core f of the shunt-magnet h. j is a horizontal support for pendulum i, the oscillation of which pendulum is limited by the stop on. jis adjustable with reference to the star-wheel It by means of a screw 0, which fixes it to the standard 0.

My lamp belongs to that class of lamps which have the carbons apart when they are ready to start. WVhen the current enters the lamp, it energizes the magnet b, causing it to draw in the core f and depressing the long end of the gear-frame g, thus disengaging the starwheel from the pendulum i. There is now no restraint upon the system of gears, and they will immediately begin to turn by the weight of the feed-rod d acting on the gear-wheel l. The feed-rod will continue to descend until the upper and lower carbons are in contact. This contact weakens the current in the shunt magnet Z), thus permitting the springe to depress the short end of the frame g until the star-wheel is brought in contact with the pendulum 2'. As the wheel can no longer turn, it is evident that any further upward motion of the long end of the carriage g will raise the feed-rod d, thus separating the carbons and starting the are. As the carbons burn away, the current in Z) will increase in strength the core f will be further depressed, as will also the carriage g. This will continue until the star-wheel will engage the extreme lower point of the pendulum, the pendulum being still against the stop m, as shown in Fig. 2. Further depression of g will cause the point of the star-wheel to slip off the lower point of the pendulum, and the wheel will begin to rotate, the pendulum swinging momentarily back to a vertical position, as shown in Figs. 1 and 3, thus bringing the extreme lower point of the pendulum nearer the center of the starwheel than it was when held against the stop on. It is clear that so long as the position of the carriage does not materially change, the star-wheel will continue to revolve, striking and swinging aside the pendulum as each point passes, the inertia of the pendulum acting to retard the revolution of the star-Wheel. As the carbons approach each other, the magnet Z) will be weakened and the long end of the carriage g will again be forced upward by the spring 6 until the pendulum once more engages the star-Wheel. This operation continues until the carbons are entirely burned away.

I find that in arc-lamp construction it is very diffieult to locate the pivot h for supporting g, so that the rack-feed rod (Z will engage the teeth of the gear-wheel Z, unless some arrangement is made so that their relative positions may be adjusted. To overcome this difficulty, I place the pivot 71 upon an arm a, forming part of the frame 0, said frame-arm being constructed, preferably, of a metal possessing some ductility. This arm is then readily bent, so as to insure proper engagement between the rack and its pinion.

From the foregoing description it will be seen that the pendulum t' and stop an constitute a device which prevents the rotation of the gearing and the consequent movement of the rod d when such stopping is necessary for the proper operation of the lamp, and also serve as a drag or regulator when the gearing is in motion, making the necessary movement of d steady and regular.

The other feature of my improvement in arc-lamps is shown in Figs. 4 and 5, in which a is a metallic cap suspended from above and having depending therefrom the U -frame I) b Z). This is secured to a by the screws 0 c. c is an annular ring of some insulating material, having attached. to it the worksplate d, the hole in the works-plate d being larger than the hole in insulating-ring 6, so that there may be no electrical connection between the two by means of the U-frame. The lower part of the U-frame carries a combined support for globe-holder and carbonholder. (Not shown in drawings.) The ring c and plate 61 are supported by the rectangular frame 1; t, which is itself suspended from the under part of said cap c.

Having now described my invention, what I claim, and desire to secure by Letters Patcut, is--- 1. In an arc-lamp, a star-wheel forming part of a system of wheel-gearing actuated -ing as a retarding device when the lamp is feeding.

2. In an arc-lamp a rack carbon-rod engaging a train of gearing terminating in a starwheel, in combination with a pendulum and stop, said pendulum engaging said star-wheel and preventing or regulating the revolution thereof, and being adjustable in a vertical plane parallel with the carriage.

3. In an arc-lamp the combinations of a rack carbon-rod and train of gearing, and means for regulating the operation of the same, with a projecting arm at, having the pivot 72, for the support of the carriage g, and adjustable in a direction parallel with the face of the carriage substantially as described.

4:. The combination in an arc-lamp of a rack carbon-rod operating by its weight a train of gearing mounted upon a tilting carriage, and terminating in the star-wheel 7;, with an adjustable pendulum i, regulating the operation of said gearing, the stop m, and the adjustable arm n, all as described for the purpose specified.

5. In an arc-lamp the cap a, having suspended from it the U-frame b, by means of the screws 0 c, and the rectangular frame 1) t", carrying an annular ring 6, and the works-plate d substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

HAROLD E. BRADLEY. Vitnesses:

EDGAR SPEARS, SADIE E. GILMORE. 

